There could be any number of computers behind an IP address, and most routers don't log which of their client computers made which request when. There are unreliable ways of identifying a machine that has previously visited a site - the most popular is storing a cookie with a random hash in the user's browser.
(April 2012) (Learn how and when to remove this template message) DMAIC (an acronym for Define, Measure, Analyze, Improve and Control) (pronounced dÉ-MAY-ick) refers to a data-driven improvement cycle used for improving, optimizing and stabilizing business processes and designs. The DMAIC improvement cycle is the core tool used to drive Six Sigma projects. However, DMAIC is not exclusive to Six Sigma and can be used as the framework for other improvement applications.
The DMAIC model is an important part of the Six Sigma methodology. When waste or inefficiencies are found in a process, the DMAIC model can help to work through it and identify solutions. It is a standard set of steps or phases that allows a team to identify root causes of problems, propose solutions, and have them implemented for long term improvements.